"a razón de" meaning in Spanish

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      "expansion": "a razón de",
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  "lang": "Spanish",
  "lang_code": "es",
  "pos": "prep",
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      "examples": [
        {
          "english": "they pay 1000 euros a year, at the rate of 250 euros per trimester",
          "text": "pagan 1000 euros el año, a razón de 250 euros al trimestre",
          "type": "example"
        },
        {
          "english": "And Mr. Anselmo began, reluctantly, to civilize the three children of Mr. Tomás, little countrymen of fertile and ingenious mischief, and to try to make them understand, at a rate of three hours a day and twenty pesos a month, and the grave, the complicated rules of arithmetic and the arduous beauties of the primer.",
          "ref": "1903, Godofredo Daireaux, “El maestro de escuela”, in Tipos y paisajes criollos - Serie IV:",
          "text": "Y don Anselmo empezó, sin ganas, a desasnar a los tres hijos de don Tomás, paisanitos de fecunda e ingeniosa travesura, y a tratar de hacerles comprender, a razón de tres horas por día y de veinte pesos al mes, y la tumba, las complicadas reglas de la aritmética y las arduas bellezas de la cartilla primera.",
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      "glosses": [
        "at the rate of"
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      "id": "en-a_razón_de-es-prep-enaZbDcf",
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          "rate",
          "rate"
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  "word": "a razón de"
}

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  "lang_code": "es",
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        {
          "english": "they pay 1000 euros a year, at the rate of 250 euros per trimester",
          "text": "pagan 1000 euros el año, a razón de 250 euros al trimestre",
          "type": "example"
        },
        {
          "english": "And Mr. Anselmo began, reluctantly, to civilize the three children of Mr. Tomás, little countrymen of fertile and ingenious mischief, and to try to make them understand, at a rate of three hours a day and twenty pesos a month, and the grave, the complicated rules of arithmetic and the arduous beauties of the primer.",
          "ref": "1903, Godofredo Daireaux, “El maestro de escuela”, in Tipos y paisajes criollos - Serie IV:",
          "text": "Y don Anselmo empezó, sin ganas, a desasnar a los tres hijos de don Tomás, paisanitos de fecunda e ingeniosa travesura, y a tratar de hacerles comprender, a razón de tres horas por día y de veinte pesos al mes, y la tumba, las complicadas reglas de la aritmética y las arduas bellezas de la cartilla primera.",
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        "at the rate of"
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  "word": "a razón de"
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